Originally published at https://monstermegs.com/blog/cpanel-security-flaw/ A critical cPanel security flaw disclosed in late April 2026 has put millions of websites at immediate risk, and the most alarming detail is that attackers were exploiting it silently for months before any public warning. Tracked as CVE-2026-41940, the cPanel security flaw allows hackers to completely bypass the login screen on the cPanel and WHM admin interface, gaining full administrator access to hosted websites without a valid username or password. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added it to its Known Exploited Vulnerabilities catalog on May 3, 2026, confirming real-world exploitation at scale. If your site is on a server running cPanel, this story is directly relevant to you.…